Abrasive holder



Sept. 11, 1934. I F. DUCATO 1,973,307

ABRASIVE HOLDER Filed Nov. 26, 1932 g I ZINVENTOR.

A TTORNEYS.

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Patented Sept. 11, 1934 UNI-TED STATES PATENT. OFFICE The present invention is designed to simplify abrasive carriers, or holders, so that different abrasive surfaces may be readily and conveniently applied. The invention is exemplified with relation to an abrasive holder used for abrasives in making, or repairing, shoes. Here a matter of great consideration is to have a carrier that will hold the abrasives securely and at the same time present a holder so small in diameter that it may e readily efiected in the rather confined spaces on shoes where it is desired to apply it. Under some conditions, the abrasives are in the form of sheets, cloth or paper, with an abrasive material formed thereon and the holder not only must form an eificient driving means, but a means for conveniently securing the abrasive sheet.

As the spindle in different applications is driven in opposite directions, it is desirable to have the holder which carries the abrasive material provided with means which looks the elements together when the spindle is rotated in either direction. The present invention is designed to make this result readily possible. Features and details of the invention will appear from the specification and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawing as follows:-

Fig. 1 shows a section of the assembled device.

Fig. 2 a section on the line 2-2 in Fig. 1.

Fig. 3 a view of the sheet-holding sleeve indicating the method of assembling an abrasive sheet.

Fig. 4 a section on the line 4-4. in Fig. 5 showing an alternative construction.

Fig. 5 an end view of the alternative construction shown in Fig. 4..

Fig. 6 a section on the line 6--6 showing a further modification,

Fig. '7 an end view of the modification shown in Fig. 6.

1 marks the driving motor, 2 the driving head, or rotor, on the motor. This has a driving pin 3.

A carrier, or holder spindle 4 has a socket 5 with an axially extending slot 6 receiving the pin 3 and a slot 6a extending in both directions from the slot 6 and inclined with the pitch of a quick thread in both directions circumferentially from the slot 6. So that with either a right or left-hand turn, the carrier is fixed on the head so that the driving torque of the motor tends to tighten it. The head has a projection '7 with a pin 7a extending into an opening 4a of the carrier, or holder, and this tends to center and steady the carrier on the driving head. A split sleeve 8 is arranged on the spindle. The spindle has flat surfaces 9 aiiording spaces 10 between these surfaces and the inner surface of the sleeve. The separation of the sleeve at 11 and 12 permits of its ready assembly on the spindle. A cushion sleeve 13 also split surrounds and is secured to the sleeve 8. An abrasive sheet 1 1 is wrapped around the cushion sleeve 13 and the ends of the sheet are brought around rounded edges 15 of the cushion sleeve 13 carried through the separation 12 of the sleeve 8 and into the spaces 10 where the sheet has a securing fold 16. A clip 17 is arranged between the edges of the sleeve 8 at the separation 12 and has a U-shaped outer arm extending into a notch 18 in the cushion sleeve and the inner arm of the clip extends into the told 16 in the ends of the abrasive sheet. The manner of assembling the sheet with the clip in place is clearly indicated in Fig. 3. The sheet is thus initially secured. Each endof the sleeve 8 is tapered and a tapered end of the sleeve engages a tapered shoulder 19. A head 21 is arranged on the spindle at the opposite end of the sleeve and has a tapered shoulder 22 engaging that tapered end of the sleeve 8. The head 21 has an internal screw thread 23 which operates on a screw thread 24 of a pin 24a. The pin 24a has a screw thread 25 which is screwed into a thread 26 in the spindle'd. The screw threads 2 1 and 25 are reversed, one having a right pitch and the other a left pitch. A set screw 2'7 operates in either socket 28 to lock the pin 24a either with the head 21, or the holder 4. Where the driving head rotates in one direction the free screw thread on the pin 24a has a pitch in a direction to tighten the head under the torque action of the rotating spindle. In this way this locking end may be made practically universal.

In Fig. 4 the sleeve 29 is made in a complete annulus with a cushion sleeve 30 and a polishing sheet 31 with an overlap at 32 securing the ends of the sheet. This may be used on the same head and utilize the same locking means as against torque.

In Figs. 6 and '7 an abrasive, or cutting tool, is supplied with a sleeve 34 which is adapted to be secured on the spindle and the sleeve having cutters 35 formed thereon. I

What I claim as new is:-

1. In an abrasive holder, the combination of a spindle; a split securing sleeve on the spindle, said sleeve and spindle being provided with a space for receiving an end of a surrounding abrasive sheet; and means securing the sleeve and exerting radial clamping pressure on the end of the abrasive sheet in the space.

2. In an abrasive holder, the combination of a spindle; a split securing sleeve on the spindle. said sleeve having tapered ends and said spindle having a tapered shoulder receiving one end of the sleeve, said sleeve being adapted to receive an end of a surrounding abrasive sheet; a head at the opposite end of the sleeve having tapered shoulders; and means exerting axial pressure on the head comprising screws reverselv arranged oi opposite pitch, and means for locking one or the other of said screws.

3. In an abrasive holder, the combination of a spindle; an abrasive carrying sleeve on the spindle; means locking. the sleeve on the spindle comprising a head; means exerting axial pressure on the head and locking the head against loosening through torque exerting on the sleeve by rotation in either direction comprising oppositely pitched screws; means for connecting the head with the spindle; and means for locking one or the other or the screws.

4. In an abrasive holder, the combination of a spindle; a split securing sleeve on the spindle; u-shaped clips along the two edges of the sleeve, said clips being adapted to receive the ends of an abrasive sheet; and means securing the sleeve on the spindle.

5. In an abrasive holder, the combination of a spindle; a split securing sleeve on the spindle; clips along the two edges of the sleeve, said clips being adapted to receive the endso! an abrasive sheet; and means securing the sleeve on the spindle and exerting radial pressure on the parts of the sleeve clamping a sheet held by the clip between the spindle and the sleeve.

6. In an abrasive holder, the combination of a spindle; a driving head for the spindle; means locking the spindle with the driving head comprising locking elements tightened through the driving torque and reversible with relation to direction; and an abrasive means carried by-the spindle comprising a sleeve with an abrasive surface, a locking head for clamping the sleeve endwise, and means locking the locking head with the spindle comprising elements tightening the looking head through the torque action of the 

